code: def nautical(kilometers=0, meters=0, miles=0, feet=0):
      """
      Convert distance to nautical miles.
      """
      ret = 0.0
      if feet:
          kilometers += feet / ft(1.0)
      if miles:
          kilometers += km(miles=miles)
      if meters:
          kilometers += meters / 1000.0
      ret += kilometers / 1.852
      return ret
  
file_path: geopy/geopy/units.py
imports: import math
label_desc: Use image node_id 9 for calling a global function with example usage: nautical(kilometers, meters, miles, feet) and returns: ret